Cascade initiated by VHE γ-rays in the radiation field of a close massive companion.

Details Cascade initiated by VHE γ-rays in the radiation field of a close massive companion. Cascade initiated by VHE γ-rays in the radiation field of a close massive companion.

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322..523b&link_type=abstract

Astronomy and Astrophysics, v.322, p.523-532

Astronomy and Astrophysics

Astrophysics

46

Gamma-Rays: General, Stars: Binaries: Close, Stars: Individual: Lsi+61 303, Cyg X-3

Scientific paper

Two massive binaries, Cyg X-3 and LSI +61 303, are inside the error boxes of γ-ray sources detected by the Compton GRO. If somewhere inside such binary systems are injected very high energy (VHE) γ-rays, as suggested by some Cherenkov observations, they may initiate the inverse Compton e^+/-^ pair cascade in the soft radiation of a massive companion, and the detected high energy γ-ray emission may be caused by the secondary γ-rays of such cascade process. Since VHE γ-rays has to propagate in the anisotropic radiation of a massive star (the place of injection does not cover with the source of soft radiation), the intensities of secondary γ-rays depend on the angles of observation measured from direction defined by the place of injection of VHE γ-rays and the center of a massive star. We compute γ-ray spectra formed in such anisotropic cascade by using the Monte Carlo method. It is found that the intensity of secondary γ-rays does not varies strongly for the angles of observation greater than ~90°, but the highest intensities are observed at the angles corresponding to the limb of a massive star. Moreover, some cascade γ-rays can also emerge from behind the massive star, i.e. from the opposite site than the location of a source of primary γ-rays. This interesting feature can be called as a focusing of γ-rays by the soft radiation of a massive star.

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